Shaikh, K.A., et al. “Bronsted Acidic Ionic Liquid: An Efficient and Reusable Catalyst for the Synthesis of Xanthenes Derivatives As Antimicrobial and Antioxidant Agents”. Asian Journal of Organic & Medicinal Chemistry, vol. 5, no. 1, May 2020, pp. 11-19, doi:10.14233/ajomc.2020.AJOMC-P218.